Some consequences are starting to be measured and we're turning our eyes because we don't like bites? I got Dengue in two occasions and I really hate these mosquitos but we must not be innocent to think there is no consequences and nature will solve this for us.
> They found that the birds produced on average two chicks per nest after spraying, compared with three for birds at control sites. > https://www.nature.com/news/2010/100721/full/466432a.html
Old compilation of papers about the consequences.